An offset mortgage is a way for the customer to use whats
in their savings account to help reduce the mortgage balance they are
charged interest on. By linking their savings to their mortgage they can
make their money work harder.

Any savings and current accounts the customer chooses to
link to an offset mortgage will not earn interest, but the more money that
is held in them the more the customer will save on his mortgage payments. As
interest is often calculated daily, even savings that are held for a few
days can reduce the interest charged.